In a 'long shot' theory, physicists propose that the world's
largest atom smasher could be used as a time machine to send a special
kind of matter backward in time.

The scientists outline a way to use the Large Hadron Collider
(LHC), a 17-mile long (27-km) particle accelerator buried underground
near Geneva, to send a hypothetical particle called the Higgs singlet
to the past.